Carburetor



Feb. 10, 1925.

i.. H. VAN BRIGGLE CARBURETOR Filed Ag, 26, 1918 2 sheets-sheet 1 ma. 1.A

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Feb'. l0, 1925. 1,526,259

L.. H. VAN BRIGGLE CARBURETOR Filed Aug. 26, 1918 2 sheets-sheet 2 gFIG. 2

Patented Feb. 10, 1925.

LILB'URN 'HOWARD VAN BB'IGGLE, OF INDIANAPGLIS, INDIANA.

GARBURETOR.

Application led August 26, 191B.

To @ZZ whom t may concern:

Be it known that I, LILBURN l-lowAnD VAN Blasons, a citizen of theUnited States, residing at Indianapolis, in the county of Marion andcitate of Indiana, have invented a new and useful Carburetor, of whichthe following is a specification.

lt is the obj ect of my invention to produce an efficient and economicalcarburetor having no moving parts and of simple and inexpensiveconstruction.V

The accompanying drawings illustrate my invention: Fig. 1 is a verticalcentral seetion through a carburetor embodying my invention; Fig. 2 is asection on the line 2 2 of Fig. 1; and Fig. 3 is a section on the line3-3 of Fig. 1.

rlhe carburetor comprises a single air con duit having a horizontalinlet portion 10, a horizontal outletportion 11, and a central verticalU-shaped portion the two legs 12 and 13 of which communicate with eachother at their lower ends and with the horizontal inlet and outletportions and 11 at their respective upper ends. The communication of theupper ends of the legs 12 and 13 with the horizontal portions 10 and 11is by relatively sharp turns past the corners 14 and 15. The effectivecross-sectional area of this conduit is preferably substantially uniformthroughout its length7 save at the point of communication 416 betweenthe two legs 12 and 13, where it is slightly contracted to give aventuri effect. The portions 10 and 11 are preferably nearly circular incross section; while in order to get them in a compact space theportions 12 and 13 are more nearly semicircular, separated by thepartition 17, so that together they occupy a substantially cylindricalspace. The contraction 16 is formed by a raised cross-rib 18 at thelower surface thereof and by the tapering lower end of the partition 17.The tapering `of such lower en d is preferably unsyinmetrical with respect to the center of the partition, so that the apex 19 of suchtapering' is well over toward the upward leg 13 of the U-shaped portionand is connected to the side of the partition 17 forming the wall of thedown` ward leg12 by a rather long incline 20. A fuel nozzle 21projeetsvertically upward within the contraction 16 well toward thelower edge of the partition 17 and is dis-` Serial N0. 251,449.

in line with the partition 17. The outlet from this fuel nozzle 21 iscontrolled by a needle 227 which extends down though the partition 17and is provided with any suitable operating means 23at the top. Thenozzle 21 receives its supply of fuel by suit- 'able passageway/s from afloat bowl 24, in

which a substantially constantfuel level maintained by a float 25operating a. float valve 2G controlling the supply of fuel thereto inthe usual manner. The float bowl 24- .fits up around the outside of theU-shaped portion 12-13, which it can do with great eompactness becauseof the substantially cylindrical shape of this U-shaped portion as awhole (Fig. 3). The float is arranged so as to maintain in the floatbowl 24 a normal liquid level barely higher than the top of the fuelnozzle 21, so that when the parts are at rest the fuel overflows fromthe nozzle 21 to fill the lower part of the U-shaped portion 12-13 tothe height of the liquid level in the float bowl. An overflow duct 27 isprovided in the partition 17 and communicates with the interior of thefioat bowl at a point slightly higher than the normal liquid level inthe float bowl 211; so as to carry off the excess fuel in case the U-shaped portion 12u13 fills to too high a level, as may sometimesmomentarily happThe inlet portion 10 is conveniently pro vided with theordinary choker valve 28. and may communicate with the atmosphere eitherdirectly as shown or through any suitable connection. it being essentialmerely that there be a substantially horizontal portion 10 supplying thedownward leg 12. Similarly,k the outlet portion 11 has the usualthrottle 29, and is provided with a flange 30 for attachment to theintake manifold. r

In operation, the tlow of air is produced by the suction of the enginein the usual manner9 and the air travels through the horizontal portion10 of the air conduit,v around the corner 14C and down through thedownwardor anterior leg 12, through the contraction 1G, upward throughthe upward or posterior leg13, around the corner 15 and throughl thehorizontal outlet portion 11, and on to the intake manifold and theengine. This iiow is controlled in the usual manner by the throttle 29,`and enrichment is caused by the choker 28 in the usual inanner. The`suction at the contraction' 16 ll() i causes fuel to beldi'scliargedfrom the nozzle 21 and mixed with the passing airto produce the desiredexplosive mixture. By providing the sharp' corners lll' and 15 aroundwhich the air must pass, and the partition 17 which extends downwardbelow the level of such corners, the air is caused to travel in atortuous path, whichv in practice seems to varyl slightly in its shapewithin the air conduit in accorda cewith the amount of airtravelingthrough said conduit-that is, ywh'ich'depends on the load and speed ofthe `A engine," aseontrolled by the throttle 29." lii'any event, Lthistortuouslyv traveling air pi cls'up the fuel from the nozzle 21 inthe'proper'proportions, (the needle 22 being properly adjusted,) forboth high and low speeds and'great and small loads; and the loadingwoi'excess of fuel at high speeds, frequently found in simple earburetors,`not vonly does not occur, :butinstead there is if anything a slightdecrease in the proportionate' amount of fuel at` higher speeds,as'isdeSirable. "This is caused to some extent' by the lateralrdisplacement between the ino'zzle'Qll and the apex'lS), vso that thelong incline 2O directs the air somewhat into the fuel niozzlefzlfln anyease, the best results" areobtained byihaving` the relatively sharpcornenlllfand by locating the nozzle 21 so that is fdispiaced",slightlytoward the; downiard leg-12 from the apex 19.

Vhen the engine stops,"tlie lower" part of the U-shapedportion 1213partly Afills with fuel,to the'level inthe oat bowl 12; and this acts asa4 priming charge Awhen the engine is nextV started, Vlas to facilitatestarting. `l'In addition, at veryv low speeds this U-shaped portion alsopartly fills with fuel, though-'to 'af lower level; and'this spool offuel serves to provide an' accelerating charge when the speedof'th'eengine is next increasedffldling Iis effectively `obtained, becauseofjthe gravity discharge of thefuel from theL` fuel `1`vlnozz'le underlow engine speeds, soitha't it is not necessary for the suction then ,todraw the fuel from the nozzle. i K

I claim asniy invention f 1. A carburetor comprisingl an air con` duithaving an' intermediate't5-shaped por? tion, and a'horizontal 'inletportion andahorizontal -Ioutlet portion connected' to the upper endsifofthe lrespectivelegs" of said U-sliapedrp'ortion, such connection betweenthe horizontal vinlet portionand the anterior leg of the-"Ubeing'b'yarelatively sharp bend andj 'af fuel` nozzlei'pi'ojecting'upwardly within and opening upwardly into the bottoin of saidUsli'apedpor'tion' at a'po'int disi placed toward the anteri legfr'om'they apex of the partition between the two-legs;

2. Acarbure 'l i' n i having an intermediate l5-'shaped' portion,

eoinpiising'a'nair conduit I' Aand a horizontal inlet portion and a hoiiarated by a partition, and a horizontal inletl portion and a horizontaloutlet port-ion connected to the upper end of the respective legs ofsaid U-shaped portion; and a fuel nozzle projecting upwardly within andopening upwardly into the bottoni of said I1shaped portion at a pointdisplaced toward the anterior leg from the apex of th(` partitionbetween the two legs.

t. A carburetor comprising an air conduit having a t-shaped portion, anda horizontal inlet portion connected to the upper end of the anteriorleg of said U-shaped portion; a fuel nozzle projecting 'upwardly withinand opening upwardly into the'bottom of said tJ-shapcd portion, the legsofsaid U-shaped portions each being substantially semi-circular incross-section so that together they Alare substantially circular in'cross-section:

within and opening upwardly into the bottom lof said U-shaped portion;and a `tloat bowl communicatingwith said fuel nozzle to supply it, thenormal liquid level in said iiioat bowl being slightly above thedischarge end of said nozzle.

"6. A carburetor comprisingan air conduit havinga U-shaped portion, anda horizontal inlet portion connected tothe upper end of the anterior legof said U-shaped portion; a fuel nozzle projecting upwardly withinand'opening upwardly into the bottoni of said U-shaped portion; andl afloat bowl communicating with said fuel nozzle tosupplyit, the normalliquid level in said tloat bowlbeing slightly above the discharge endof' said nozzle, and an overflow duct couimunic'ating withv saidU-shaped portion at a tained in saidfloatibowl." f

7. A carburetor comprisingan air con yduithaving a U-shaped portion',and a horizontal inlet portion connected to the upper e'ndof thelanterior leg-of said U-shaped portion, said conduit -being'sliglitlycon tracted where the two legs of the U-shaped portion communicate witheach other; and a fuel nozzle projecting upwardly within and openingupwardly into the bottom ot said U-shaped portion at a point displacedtoward "the anterior leg from the apex of the partition between the twolegs.

8. A carburetor comprising an air conduit having a U-shaped portion, anda horizontal inlet portion connected` to the upper end of the anteriorleg of said U-shaped portion, said conduit being slightly contractedwhere the two legs of the Ushaped portion communicate with each other;and a fuel nozzle porjecting upwardly within and opening upwardly intothe bottom of said U-shaped portion, the lower end of the partitionbetween the two legs of the U- shaped portion being tapered, with theapex of such taper olset from the fuel nozzle toward the posterior legof the U.

9. A carburetor comprising an air conduit having' a U-shaped portion,and a horizontal inlet portion connected to the upper end of theanterior leg of said U-shaped portion, such connection between thehorizontal inlet portion and the anterior leg of the U being by arelatively sharp bend; and a vfuel nozzle projecting upwardly within andopening upwardly into the bottom of said U-shaped portion at a pointdisplaced toward the anterior leg from the apex of the partition betweenthe two legs.

l0. A carburetor comprising an air conduit having a U-shaped portion,and a horizontal inlet portion connected to the upper end of theanterior leg of said U-shaped portion; and a fuel nozzle projectingupwardly within and opening upwardly into the bottoni of said U-s-hapedportion at a point displaced toward the anterior leg from the apex ofthe partition between the two legs.

In witness whereof, I have hereunto set my hand at Indianapolis,Indiana, this 23d day of August, A. D. one thousand nine hundred andeighteen.

LILBURN HOWARD VAN BRIGGLE.

Witnesses:

OTTIs J. CLEMANS, GEO. B. SGHLEY.

